Water Vapor

The gas form of water - water vapor forms when water boils or evaporates

Condensation

The process by which a gas changes into a liquid.
Condensation causes droplets to form on the outside of a glass as water in the air lost heat energy and cooled off.

Precipitation

Water that falls from clouds to Earth's surface.
Precipitation can be solid, like snow, or liquid, like rain.

Barometere

An instrument for measuring air pressure.
A falling barometer usually means a greater chance of rain.

Hygrometere

An instrument for measuring humidity.
A decreasing hygrometer reading usually indicates a lower chance of rain.

Air Mass

a huge body of air that has similar temperature, humidity, and air pressure at any given height

Front

the border where two air masses meet

Climate

The pattern of weather an area experiences over a long period of time.
It is the averate of weather conditions over many years.
Living things adapt to their environment - such as:
The living things in a desert are adapt to a dry climate.

Water that falls from the air to Earth is _______.

Percipitation

The Average of weather conditions in an area over many years is __________.

Climate

When water boils, it enters the air as _________, the gas form of water.

Water Vapor

A large body of air that has the same temperature and humidity is an ___________.

Air Mass

The border between two air masses is a __________.

Front

Water vapor becomes liquid water during the process of ______________.

Condensation

Air pressure is measured with a _____________.

Barometer

Humidity is measured with a ______________.

Hygrometere

Where is most of Earth's water located?
A. in lakes
B. in rivers
C. in the oceans
D. in the ground

C in the oceans

In the water cycle, what happens just before water condenses in clouds?
A. Water falls in rain.
B. Water evaporates.
C. Water vapor changes to a gas.
D. Water dissolves salt in the ocean.

C Water vapor changes to a gas

How does the process occurring on the outside of the glass in the picture below relate to weather?
A. Water freezes along fronts.
B. Water evaporates to form winds.
C. Water flows in ocean currents.
D. Water condenses to form precipitation.

D. Water condenses to form precipitation

What type of weather does El Nino bring to the west coast of North America?
A dry weather
B mild weather
C wet weather
D sunny weather

C wet weather

What is shown in the picture in question 20?
A tornado
B huricane
C cold front
D warm front

Cold Front

What type of weather would most likely occur if a cold front moved into your area?
A stormy weather
B warm weather
C sunny weather
D cloudy weather

Stormy weather

Cause and Effect
Fog or dew can form when?
A Clouds descend to Earth's surface.
B air masses collide along a front.
C the ground loses heat more slowly than the air does.
D water vapor in humid air directly above the ground condenses.

C the ground loses heat more slowly than the air does.

Ice melts and water boils at
A 0 F, 32 F
B 0 F, 212 F
C 0 C, 100 C
D 32 C, 100 C

C 0 C, 100 C

On a weather map, you see the symbol for a low-pressure system near the area where you live.
Infer how the weather is about to change.

The weather is about to rain.

What two instruments are most important for measuring a region's weather?
Explain your answer.

Thermometer because it measure air temperature.
Barometer because it measure the air pressure, which will let you know the weather is about to change.

Draw a picture of the type of cloud that my cause drizzle and
a picture of the type that may cause
thunderstorms.
Label your drawings.

Drizzle - Stratus clouds
Thunderstorms - Cumulonimbus clouds

Several factors affect weather changes. Explain what causes air pressure in an area of change.

Air pressure changes weather because if it is cold air it is denser (thicker) and that exerts more pressure than warm air. Increasing air pressure often occurs just before colder air arrives. Since cold air usually has less water in it than warm air does,